Alan Squire
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Everything I need; nothing superfluous... I also like the programming-language-like functions, such as SQRT()... Two suggestions: (1) For consistency, Y^x and x√Y might be clearer as X^y and y√X... especially since ROOTN(X,y) is easier to remember; and the X^2 and √X are already labeled that way... (2) Maybe capitalize LN and LOG... One issue: TAN gives incorrect result for 90°. Similarly for other trigonometric functions. (My own stack-based calculator, written in C, does the same thing.)